Hi Harshad, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on ext4/dev] [also build test ERROR on next-20200820] [cannot apply to tip/perf/core tytso-fscrypt/master v5.9-rc1] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Harshad-Shirwadkar/ext4-add-free... base: https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev config: i386-randconfig-s001-20200820 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-191-g10164920-dirty # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ld: fs/ext4/mballoc.o: in function `ext4_blkno_to_flex_offset': ld: fs/ext4/mballoc.o:fs/ext4/mballoc.c:407: more undefined references to `__umoddi3' follow # https://github.com/0day-ci/linux/commit/db488bc7c0ef14f7ea22209b8faaddaff... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Harshad-Shirwadkar/ext4-add-free-space-extent-based-allocator/20200821-095647 git checkout db488bc7c0ef14f7ea22209b8faaddaffcfabbd5 vim +407 fs/ext4/mballoc.c 403 404 static inline int ext4_blkno_to_flex_offset(struct super_block *sb, 405 ext4_fsblk_t blkno) 406 { 408 EXT4_SB(sb)->s_blocks_per_group); 409 } 410 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org